1. College of Geoscience and Surveying EngineeringChina University of Mining and TechnologyBeijing 100083 China
2. Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary MineralsShandong University of Science and TechnologyQingdao 266590 Shandong China
3. Development and Research Center of China Geological SurveyBeijing 100037 China
4. School of Energy Science and EngineeringHenan Polytechnic UniversityJiaozuo 454000 Henan China
5. China United Coalbed Methane Corporation LimitedBeijing 100015 China